JPH0834991A - Detergent with no need of rinse - Google Patents

Abstract

PURPOSE:To obtain an excellent, stable and liquid detergent to be used without the need of aqueous rinse, having degreasing power comparable to those of chlorine-based solvents. CONSTITUTION:This detergent with pH7-9.5 comprises (1) 1-25wt.% of an alkanolamlne, (2) 1-20wt.% of a glycol ether, (3) 1-10wt.% of a polyoxyethylene- polyoxypropylene block polymer, (4) 1-20-wt.% of a 6-12C fatty acid, (5) 1-20wt.% of a 6-18C dicarboxylic acid, and (6) water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to metals, ceramics,
The present invention relates to a water-based cleaning agent used for degreasing cleaning of glass, plastic and the like.

[0002]

2. Description of the Related Art Conventionally, as industrial degreasing detergents for metals, ceramics, glass, plastics, etc., water-based detergents represented by alkali detergents and solvent-based detergents represented by 1,1,1-trichloroethane. A cleaning agent is used.

Alkali detergents include nonionic surfactants typified by polyoxyethylene alkylphenyl ethers, anionic surfactants typified by sodium alkylbenzenesulfonate, sodium carbonate, sodium silicate, and borosurfactants. Sodium phosphate, sodium phosphate, sodium hydroxide, alkali salts such as potassium hydroxide, sodium tripolyphosphate, ethylenediaminetetraacetate, nitrilotriacetate, chelating agents such as gluconate, benzotriazole, amines, alkanolamines, A rust preventive such as sodium nitrite is appropriately mixed. The blending composition is, for example, Tsuji Recommendation "Precision Cleaning Technology" Engineering Book p117-120, Tsuji Recommendation "Precision Cleaning Technology Manual" New Technology Development Center p50.
-56, items to be cleaned, metal,
Various types have been proposed depending on the stain.

The degreasing cleaning process using this water-based cleaning agent is
Usually, it comprises a washing step, a rinsing step with water washing, and a drying step with hot air or the like. On the other hand, chlorine-based solvents such as 1,1,1-trichloroethane are excellent in degreasing power and penetrating power,
It can be applied to all kinds of degreasing such as drawing oil and press oil, and is used in the field of washing articles with complicated structures and precision parts that require high cleanliness.

The degreasing and washing step using a chlorine-based solvent such as 1,1,1-trichloroethane usually comprises a washing step, a rinsing step with its distillate, and a drying step with its vapor. A system for continuously distilling and condensing is used. However, in recent years, environmental problems such as groundwater pollution, air pollution, and ozone layer depletion due to chlorine-based solvents have become prominent, and in the industrial world, conventional water-based cleaning agents have been applied as cleaning agents to replace them. I am doing it.

[0006]

However, when the conventional water-based cleaning agent is used, a rinsing step by washing with water is usually required after the washing step, and there is a problem that a large amount of waste water is discharged from this step. Therefore, it is unavoidable that a method of omitting the water rinsing step has been tried, but the components of the cleaning agent are
It remains on the surface of the article as a residue, and it causes problems such as solid foreign matter and stains, rusting, discoloration, and adverse effects on post-processes such as painting, welding, and adhesion. Only possible for washing.
Therefore, there is a demand for a water-based cleaning agent which has a small amount of residue, is less likely to be a solid foreign matter or stains, is excellent in rust-preventive properties, and has no influence on a post-process even when used without rinsing with water.

Conventional water-based detergents have been prepared by adding a large amount of nonionic surfactant or increasing the amount of alkali salt to raise the pH in order to increase the degreasing power and penetrating power. However, when it is used without rinsing with water, it becomes difficult to increase the amount of residue, to make solid foreign matter, and to make it into a stable liquid state as a product, and also to adversely affect the non-ferrous metal, and to reduce the safety for workers, which is not preferable. As a stable liquid method, for example, there is a method using sodium aromatic carboxylate as shown in Japanese Patent Publication No. 63-13480, but paratertiary butyl benzoate used as a representative of aromatic sodium sodium carboxylate. Sodium acid has a problem that it adversely affects the kidney and the liver.

[0008]

As a result of intensive studies, the present inventors have found that alkanolamines, glycol ethers,
It has been found that the above problems can be solved by combining a block polymer, a fatty acid and a dicarboxylic acid, and the present invention has been completed. That is, the present invention is
At least (1) alkanolamine 1 to 25% by weight (2) glycol ether 1 to 20% by weight (3) polyoxyethylene polyoxypropylene block polymer 1 to 10% by weight (4) fatty acid having 6 to 12 carbon atoms 1 to 20 % By weight (5) Dicarboxylic acid having 6 to 18 carbon atoms 1 to 20% by weight (6) Water and having a pH of 7 to 9.5.

Examples of the alkanolamine include ethanolamines such as monoethanolamine, diethanolamine, triethanolamine and alkylated products thereof. If the amount of the alkanolamine is less than 1% by weight, the detergency is lowered, and if it is more than 25% by weight, it is corrosive to non-ferrous metals, especially aluminum, the amount of residue is increased when not rinsed with water, and the coating is adversely affected. Not preferable.

As the glycol ether, ethylene glycol monoalkyl ether, ethylene glycol monophenyl ether, diethylene glycol monoalkyl ether, diethylene glycol monophenyl ether, triethylene glycol monoalkyl ether, triethylene glycol monophenyl ether, propylene glycol monoalkyl ether, Propylene glycol monophenyl ether, dipropylene glycol monoalkyl ether, dipropylene glycol monophenyl ether, tripropylene glycol monoalkyl ether, tripropylene glycol monophenyl ether and the like can be mentioned. As the alkyl group, linear, branched or cyclic ones having 1 to 8 carbon atoms are preferably used. If the amount of glycol ether is less than 1% by weight, the residue is likely to become solid when not rinsed with water. If the amount is more than 20% by weight, the amount of residue increases and adverse effects on coating and the like are not preferable.

As the polyoxyethylene polyoxypropylene block polymer, one having an average molecular weight of the polyoxypropylene portion of 600 to 2000 and a proportion of ethylene oxide of 10 to 40% by weight is preferably used. If the blending amount is less than 1% by weight, the detergency will be reduced and 10
If it exceeds 5% by weight, the amount of residue increases and the coating is adversely affected.

The fatty acid having 6 to 12 carbon atoms is a component necessary for keeping the detergent of the present invention in a stable liquid state in a wide temperature range from a low temperature below room temperature to a high temperature above 50 ° C. Is a straight-chain fatty acid such as hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid and their branched fatty acids such as 2-
Examples thereof include ethylhexanoic acid and 3,5,5-trimethylhexanoic acid. When the carbon number is less than 6, unpleasant odor becomes strong, and when it is more than 12, foaming becomes large, which is not preferable. If the amount added is less than 1% by weight, it becomes difficult to maintain a stable liquid state, and if the amount added is more than 20% by weight, the degreasing power decreases, which is not preferable.

The dicarboxylic acid having 6 to 18 carbon atoms includes
Adipic acid, pimelic acid, azelaic acid, sebacic acid,
1,9-nonamethylenedicarboxylic acid, 1,10-decamethylenedicarboxylic acid, 1,11-undecamethylenedicarboxylic acid, 1,12-dodecamethylenedicarboxylic acid,
1,13-Tridecamethylenedicarboxylic acid, 1,14-
Examples thereof include tetradecamethylene dicarboxylic acid, 1,15-pentadecamethylene dicarboxylic acid, and 1,16-hexadecamethylene dicarboxylic acid. If the number of carbon atoms is less than 6, the anticorrosion property against iron becomes poor, and if it is greater than 18, the residue tends to become solid when used without water rinsing, which is not preferable. If the addition amount is less than 1% by weight, the rust preventive property becomes inferior, and if it is more than 20% by weight, the residue tends to become solid when used without water rinsing, which is not preferable.

Water is used as a solvent for forming a uniform liquid product of a detergent active ingredient such as alkanolamine, glycol ether, polyoxyethylene polyoxypropylene block polymer, fatty acid and dicarboxylic acid. The amount thereof is determined so that the total amount of water and the amount of the above-mentioned active ingredient of the detergent and known additives described below and the like becomes 100% by weight. The pH of the detergent is adjusted to 7 to 9.5, preferably 7 to 9, and more preferably 7 to 8.5. When it is lower than 7, stability to iron becomes poor, and when it is higher than 9.5, stability to aluminum becomes poor, and irritation to skin becomes strong, which is not preferable.

When the cleaning agent of the present invention is used in the actual cleaning step, it is further diluted with water before use. The concentration of the active ingredient of the detergent at that time is usually 0.05 to 5% by weight. This cleaning agent active ingredient concentration, cleaning method, cleaning articles, dirt,
It is appropriately adjusted depending on conditions such as post-processes. In the present invention, other surfactants, known additives, for example,
Gluconate, ethylenediaminetetraacetate, chelating agents such as nitrilotriacetic acid salts, benzotriazole, amines, corrosion inhibitors such as nitrites, defoaming agents such as fatty acid oil and silicone oil, methanol, ethanol, isopropanol, n- Propanol, n-butanol, isobutanol, t-butanol, n-amyl alcohol, isoamyl alcohol, s-amyl alcohol, t-amyl alcohol, alcohols such as benzyl alcohol, and solvents such as pyrrolidone and N-methylpyrrolidone are appropriately mixed. It is also possible to use it.

[0016]

The present invention will be described below with reference to examples. (Examples 1 to 5 and Comparative Examples 1 to 3) The cleaning agents shown in Table 1 were blended and the following tests were conducted. The results are shown in Table 2. (1) Degreasing Power Test A 30-mesh stainless steel wire net (60 × 30 mm) was impregnated with the following metalworking oil and heated at 100 ° C. for 30 minutes.
This was washed with a 3% by weight aqueous solution of the cleaning agent in Table 1, dried without rinsing with water, and the degreasing rate was calculated from the amount of attached oil before and after washing with the following numerical formula 1, to obtain 1,1,1-trichloroethane. Comparative evaluation with degreasing by. Metalworking oil used in the test:
Unicut GH35 (trade name, manufactured by Nippon Oil Co., Ltd.)

(2) Stability test The detergents in Table 1 were kept at -5 ° C, 30 ° C and 50 ° C and observed for separation and precipitation of the detergent active ingredients. (3) Evaporation residue test 0.3 μl of the cleaning agent shown in Table 1 was dropped on a hole slide glass and dried at 120 ° C. for 30 minutes, and then the property of the residue was evaluated. (4) Coating adhesion test An aluminum plate was washed with a 3% by weight aqueous solution of the cleaning agent shown in Table 1, dried without rinsing with water, and then coated with a lacquer. Adhesion of the coating film, JISK5400 cross-cut test (1mm
It was determined by 100 squares). (5) Anticorrosion test According to DIN51-360, a chip of FC20 is placed on a filter paper, and a 3 wt% aqueous solution of the cleaning agent of Table 1 is dropped,
It was left for 2 hours at ℃. The rust prevention property was judged by the amount of rust transferred to the filter paper.

[0018]

[Equation 1]

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

INDUSTRIAL APPLICABILITY The present invention is a stable liquid excellent cleaning agent having a degreasing power comparable to that of a chlorine-based solvent and can be used without a water rinse.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // B08B 3/08 A 2119-3B (72) Inventor Itsuki Matsuzaki Kosugaya-cho, Sakae-ku, Yokohama-shi, Kanagawa 1695 (72) Inventor Takashi Tokuue 97-6 Sawa-cho, Asahi-ku, Yokohama-shi, Kanagawa

Claims (1)

[Claims] 1. At least (1) alkanolamine 1 to 25% by weight (2) glycol ether 1 to 20% by weight (3) polyoxyethylene polyoxypropylene block polymer 1 to 10% by weight (4) carbon number 6 to 12 1 to 20% by weight (5) a dicarboxylic acid having 6 to 18 carbon atoms 1 to 20% by weight (6) water and having a pH of 7 to 9.5.